Pipe seal assembly for poured concrete on-site waste disposal system components

Abstract

An improved pipe seal assembly for use in the walls of a poured concrete tank or box in an on-site waste disposal system, a drainage system, and other poured concrete structures, the assembly including a seal member having an inclined, frusto-conical shaped wiper flange which is integrally connected by a living hinge to a cylindrical seal body, the wiper flange initially extending outwardly when the seal member is formed, such as by injection molding, but then folded inwardly about the living hinge member to its normal operating position. The improved pipe seal assembly includes an integrally-formed tearaway membrane, which has a pull tab member and associated score lines, to permit the membrane's selective removal when desired, thereby allowing the seal member to slideably receive a pipe extended through the folded wiper blade. The inwardly folded wiper flange also acts to releasably retain a mandrel to permit in-place casting of the improved pipe seal assembly within the wall of a poured concrete box or tank member.

I claim: 
     
       1. In an improved seal apparatus for use in on-site waste disposal systems of the type having a poured concrete box member with side walls and a plurality of side wall openings for receiving inlet and outlet lines extending therethrough, the seal apparatus being cast in place in the side wall openings and having a cylindrical seal wall member which has a radially outwardly directed attachment member for casting in place within the side wall of the poured concrete box member for securement thereto, the improved seal apparatus being capable of being held in place during the casting process by a mandrel member having a gripper element for releasably gripping the improved seal apparatus, the improvement comprising in combination: an angled, flexible wiper blade member integrally connected to the cylindrical seal wall member at one end by a living hinge member, and at its other end having an open free end, said wiper blade member initially extending radially inwardly of said seal wall member along a first outwardly-directed position, said wiper blade member capable of being readily folded about said living hinge member to a second reverse-angled inwardly-directed position, whereby in said folded position said free end of said wiper blade member is capable of being releasably retained by the gripper element of the mandrel member during casting in place, and further whereby said free end is capable of sealably receiving a drainpipe extended therethrough;   a removable membrane integrally formed across said cylindrical wall member at an end opposite said living hinge member, said membrane having configured score line means for enabling quick severing removal of said membrane from said wall member when desired, to thereby open said seal apparatus to permit insertion of a drainpipe through said open free end of said wiper blade member;   said living hinge member comprising a reduced wall section at a peripheral end of said cylindrical wall member interconnected to a reduced thickness section of said wiper blade member; and   wherein said reduced wall section is formed by an obtuse angle between said wall member and said wiper blade member and said reduced thickness portion is formed by a substantially perpendicular angle between said wall member and said wiper blade member.   
     
     
       2. The invention of claim 1, wherein each of said obtuse angle and said perpendicular angle have an apex, and wherein said apex of said perpendicular angle is located axially outwardly along said cylindrical wall member than the apex of said obtuse angle. 
     
     
       3. The invention of claim 1, wherein said score line means comprises at least one notch-shaped groove formed in said removable membrane adjacent the periphery of said cylindrical seal wall member, and including an additional configured score line formed along said removable membrane axially interiorally of said at least one groove, and adjoined with said least one groove, to thereby permit an initial tearing of said score line. 
     
     
       4. The invention of claim 3, wherein said groove is formed on the side of said removable membrane facing axially outwardly from said wall member. 
     
     
       5. The invention of claim 3, and including a pull tab member integrally formed with said removable membrane and extending axially thereof, said pull tab member being partially encompassed by at least a portion of said configured score line means, whereby when a removal force is applied to said pull tab member the tearing of said removable membrane commences adjacent said pull tab member along said configured score line means and continued pulling on said pull tab causes tearing of said removable membrane along said at least one peripheral groove until said removable membrane is fully severed from said seal wall member. 
     
     
       6. The invention of claim 5, wherein said pull tab member includes a pointed base portion whereby a removal force applied to said pull tab member causes the initial tearing of said removable membrane to occur along said pointed base portion. 
     
     
       7. A pipe seal assembly of the type to be cast in place within a poured concrete on-site waste disposal box and having a cylindrical seal wall member having first and second ends, the improvement comprising a tearaway membrane member integrally formed with said cylindrical seal wall member at said first end so as to close off said pipe seal assembly, said membrane member capable of being fully removed so as to create a passage throught the interior of said pipe seal assembly within which a drainpipe may be extended and said tearaway membrane including at least one score line formed on the surface thereof along the peripheral connection of said tearaway membrane with said cylindrical seal wall member, to thereby permit ready removal of said tearaway membrane from said pipe seal assembly when desired, and including a pull tab member formed on said tearaway membrane and configured additional score line means, whereby pulling of said pull tab member causes said additional score line means to tear open, while continued pulling of said tab member causes said peripheral score line means to be completely severed, such that said tearaway membrane is readily fully removed from said pipe seal assembly; a radially inwardly-extending flexible wiper flange member integrally connected to said second end of said cylindrical seal wall member by a living hinge member, said wiper member initially formed to extend angularly outwardly of said cylindrical seal wall member but being capable of being folded about said living hinge member so as to extend angularly inwardly of said cylindrical seal wall member, whereby said wiper member is capable of being snap-fitted in position upon a casting mandrel when being cast in place in a poured concrete wall, and also capable of slidably and sealably receiving a drainpipe extended therethrough,   and wherein said living hinge member comprises a mating integral interconnection of a reduced wall thickness along the periphery of said cylindrical seal wall member at said first end and a reduced thickness portion of said wiper flange member.